JP2522192B2 - Chromaki synthesizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video synthesizing device, and more particularly to a chroma key synthesizing device for generating an image in which another screen is set only in a specific color region.

[0002]

2. Description of the Related Art A method of synthesizing a screen by using a chroma key is often used in current television programs, and is important as a method for expressing a plurality of information in an easy-to-understand and effective manner.

FIG. 11 is a block diagram showing an example of a conventional chroma key synthesizing device, and FIG. 12 is a flow chart schematically showing the flow of generation and synthesis of various signals.

In the chroma-key video signal a, as shown in FIG. 12, it is assumed that the subject 111 and its shadow 112 are reflected with the blue background 113 as the background. By inputting this chroma key video signal a, the chroma key signal generator 1
01 generates a cancel video signal b and a chroma key signal c. In the chroma key signal c, the blue back 113 part has a key level of 100%, and the shadow 112 part has an intermediate key level.

The video synthesizing section 102 has a cancel video signal b, a chroma key signal c, and a background video signal d.
And are input to generate a composite video signal e. As shown in FIG. 12, the composite video signal e becomes a video in which the subject 111 and its shadow 112 are composited with the background video d as the background. Hereinafter, a composite image including such a shadow is referred to as a shadow chroma key image. By using such a shadow chroma key image, it is possible to obtain a realistic and effective image even if it is a composite image.

A second conventional example capable of generating a shadow chroma key image is a television special effect device disclosed in Japanese Patent Laid-Open No. 64-870. This special effect device can form a shadow having the same shape as the subject at a fixed position on the lower left side of the subject, and can also set the shadow color by a shadow matte signal.

[0007]

However, in the chroma key synthesizing device of the first conventional example, it is necessary that the shadow 112 of the subject is captured at the stage of the chroma key video signal a, and the synthesizing is performed for a video without a shadow. It was impossible to output a shadow chroma key image as the image signal e.
In addition, the shadow portion of the composite image is fixed at the position of the shadow of the subject, so that it is not possible to freely change it apart from the chroma key image, and it is also impossible to change the material of the shadow portion.

In the second conventional example, the shadow of the subject can be created, but the shadow creation position and shape cannot be freely set. Also, although the shadow color can be set, the material of the shadow part cannot be set.

An object of the present invention is to provide a chroma key composition device capable of arbitrarily setting a shadow portion in a shadow chroma key image.

[0010]

A chroma-key synthesizing apparatus according to the present invention comprises a chroma-key signal generating means for inputting a chroma-key video signal including a subject image and generating a cancel video signal and a chroma-key signal consisting of the subject image only. The shadow material signal and the shadow key are input by inputting the shadow material video signal and the chroma key signal, and giving a desired shape, a desired size, and / or a desired position to at least the form represented by the chroma key signal. An image for combining the shadow chroma key image by an image effect means for generating a signal, the shadow material signal and the shadow key signal forming the shadow portion, the cancel video signal, the chroma key signal and the background video signal. And a synthesizing means.

[0011]

By combining the cancel video signal, the chroma key signal and the background video signal, a chroma key video in which the subject image is combined with the background image can be obtained. Further, the image effect means generates a key signal of the shadow portion from the chroma key signal in an arbitrary form, and the key signal and the shadow material signal are combined to form the shadow portion of the chroma key image. Therefore, the video synthesizing unit synthesizes the cancel video signal, the chroma key signal, the background video signal, the shadow material signal, and the shadow key signal to generate the shadow chroma key video.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a chroma key composition device according to the present invention. In the figure, a chroma key signal generator 1 inputs a chroma key video signal a and generates a cancel video signal b and a chroma key signal c.

The DVE (Digital Video Effect) unit 2 is also called a digital image effect device, and digitizes an input video signal, writes it in an image memory, and reads it out under various controls to enlarge the input video. ,
Special effects such as reduction, deformation and movement can be obtained.

The DVE section 2 in the present embodiment inputs the chroma key signal c from the chroma key signal generating section 1 and the shadow video signal g indicating the material of the shadow portion, respectively, and makes a desired control according to size / shape control and position control. A shadow form is created, and the shadow video signal g is converted into a DVE video signal h which is a shadow material signal, and the chroma key signal c is converted into a DVE key signal i which is a shadow key signal.

The video synthesizing unit 3 is a chroma key signal generating unit 1.
The canceled video signal b and the chroma key signal c from
The DVE video signal h and the DVE key signal i from the DVE unit 2 and the background video signal d serving as a background video are input, and they are combined to output a final chroma key composite video signal f.

The operation of this embodiment will be described below with reference to a specific image example.

First, in the chroma-key video signal a input to the chroma-key signal generating section 1, it is assumed that the subject 11 is reflected with the blue background 12 as the background, as shown in FIG.

A chroma-key video signal a as shown in FIG.
, The chroma key signal generator 1 outputs a cancel video signal b as shown in FIG. 3 and a chroma key signal c as shown in FIG. 4, respectively. Canceled video signal b
In the chroma key signal c, the blue back 12 portion becomes an achromatic image, and in the chroma key signal c, the blue back 12 portion has a key level of 100%.

The shadow video signal g input to the DVE unit 2 is assumed to be a material video signal having a pattern as shown in FIG. In the DVE unit 2, the same deformation operation is performed on the chroma key signal c and the shadow video signal g in order to create a shadow portion that extends obliquely from the subject 11. As a result, the shadow video signal g becomes a DVE video signal h (shadow material signal) in which the pattern is obliquely deformed as shown in FIG. 6, and the chroma key signal c also shows the shape of the subject portion as shown in FIG. It becomes a diagonally deformed DVE key signal i (shadow key signal).

Assuming that the background image is the background image signal d as shown in FIG. 8, the image synthesizing unit 3 causes the cancel image signal b and the chroma key signal c and the DVE image signal as shown in FIG. The h and DVE key signals i and the background video signal d are input respectively. Thus, the composite video signal f as shown in FIG. 10 is generated.

In the composite image shown in FIG. 10, the subject shown in FIG. 3 is synthesized with the image shown in FIG. 8 as the background, and the shadow portion having the shape shown in FIG. It is synthesized. Of course, the position and shape of this shadow portion can be arbitrarily set by the control of the DVE unit 2, and the material of the shadow portion can also be arbitrarily set with colors and patterns by changing the shadow image signal g. it can.

[0023]

As described in detail above, in the chroma key synthesizing device according to the present invention, the key signal of the shadow portion is generated from the chroma key signal by the image effect means, and the key signal and the shadow material signal are synthesized to obtain the chroma key signal. The shadow part of the image is formed. Therefore, the shadow portion in the shadow chroma key image can be formed in any size and shape at any position, and the shadow material can also be arbitrarily selected. Therefore, it is possible to obtain a more realistic and effective shadow chroma key image.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a chroma key composition device according to the present invention.

FIG. 2 is a schematic diagram showing an example of an image represented by a chroma key image signal a.

FIG. 3 is a schematic diagram of an image represented by a cancel image signal b.

FIG. 4 is a schematic diagram of an image represented by a chroma key signal c.

FIG. 5 is a schematic diagram showing an example of an image represented by a shadow image signal g.

FIG. 6 is a schematic diagram of an image represented by a DVE image signal h (shadow material).

FIG. 7 is a schematic diagram of an image represented by a DVE key signal i (shadow key).

FIG. 8 is a schematic diagram showing an example of an image represented by a background image signal d.

FIG. 9 is a schematic flowchart showing a part of the flow of various signals according to the present embodiment.

FIG. 10 is a schematic diagram of an image represented by a composite image signal f.

FIG. 11 is a block diagram showing an example of a conventional chroma key composition device.

FIG. 12 is a flow chart schematically showing a flow of generation and combination of various signals in the conventional example.

[Explanation of symbols]

 1 Chroma key signal generator 2 DVE 3 Video synthesizer 11 Subject 12 Blue background

Claims (3)

(57) [Claims] 1. A chroma key composition device for generating a shadow chroma key image having a shadow portion, wherein a chroma key image signal including a subject image is input, and a cancel key signal and a chroma key signal which consist only of the subject image are generated. The shadow material signal and the shadow material signal are input by inputting the video signal for the shadow material and the chroma key signal, and giving a desired shape, a desired size, and / or a desired position to at least the form represented by the chroma key signal. An image effect means for generating a shadow key signal, the shadow material signal and the shadow key signal forming the shadow portion, the cancel video signal, the chroma key signal and the background video signal to synthesize the shadow chroma key image. Video composition means Chroma key composition and wherein the. 2. The chroma key composition device according to claim 1, wherein the image effect means is a digital image effect device (DVE). 3. A chroma key signal generating device for generating a chroma chroma key image having a shadow portion, wherein a chroma key image signal including a subject image is input to generate a cancel video signal and a chroma key signal consisting of the subject image only. Inputting the generation means, the video signal for shadow material and the chroma key signal, the pattern of the video signal for shadow material and the shape represented by the chroma key signal are deformed, enlarged or reduced, and / or moved, Image effect means for respectively generating a shadow material signal and a shadow key signal, the shadow material signal and the shadow key signal forming the shadow portion, the cancel video signal, the chroma key signal and the background video signal Projection that combines shadow chroma key images An image synthesizing means, and a chroma key synthesizing device.